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Design of Effective Receiver in Hospital Wireless Network Using Turbo Code
Gyeong-Hyu Seok,Jong-Yun Kim,Byung-Kwan Lim,Dong-Gyun Ryu,Suk-Il Kim 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10
In this paper, we considered the received signal of the wideband CDMA systems using turbo code in the multipath channel environments, and analyze the performance of the system. This study is to analyze the performance for the variable system bandwidth according to the number of branches of rake receiver by passing the received signal through a rake receiver with a turbo code in Rayleigh fading channel environments. For the design of receiver in wideband CDMA systems, we presented the efficient parameters for the number of iterative decoding and the number of branches of rake receiver.
Gyeong Sook Cho,Dae Sung Kim,Dong-Hyun Lee,Hyung Mi Lim,Seung Ho Lee,김종엽 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
Colloidal silica is prepared by hydrolysis of TEOS, direct oxidation of Si powder, condensation of silicicacid, etc. There are differences in surface reactivity of silica particle due to the preparation routes. Therefore, it is usefulto evaluate surface properties accurately in order to understand the physiochemical properties of the products. The surfacecharge density, site density and zeta potential with respect to three types of colloidal silica were estimated and discussed. The surface charge density was different depending on preparation method. It is decreasing in the order of direct oxi-dation, ion exchange, TEOS hydrolysis. The zeta potential is decreasing in the order of ion exchange, TEOS hydrolysis,direct oxidation. The order in surface charge density is different from that in zeta potential because of the differencein stability depending on the particle size and surface charge density.
Lim, Sung Yul,Kim, Yang-Rae,Ha, Kyungyeon,Lee, Jong-Kwon,Lee, Jae Gyeong,Jang, Woohyuk,Lee, Jin-Young,Bae, Je Hyun,Chung, Taek Dong The Royal Society of Chemistry 2015 Energy & environmental science Vol.8 No.12
<P>Hydrogen is in the lime light as a carbon-free alternative energy source due to its high energy conversion efficiency. Solar-driven water splitting is one of the most promising methods for renewable hydrogen production. However, commercialization of a photoelectrochemical hydrogen production system remains a great challenge. One of the emerging concerns is the development of an inexpensive and transparent catalyst, which does not obstruct the light pathways to the semiconductor electrode. Here we report a non-noble metal electrocatalyst for hydrogen evolution, Ni-Mo, which is directly patterned on amorphous Si (a-Si) by light-guided spatially selective electrodeposition without consecutive photolithography processes. A light pattern is illuminated onto the a-Si using a digital micromirror device to commence the photoelectrochemical deposition. The catalyst patterned by the proposed method not only admits sufficient light to a-Si but also enables long distance carrier transport along the inversion layer, as previously observed in crystalline Si (c-Si) photocathodes. This new electrodeposition method enables mask-free patterning on a-Si and is expected to expedite a lower cost, more efficient, and self-biasing integrated photoelectrochemical water-splitting device.</P> <P>Graphic Abstract</P><P>For photoelectrochemical hydrogen production, a non-noble catalyst is directly patterned onto the photocathode using a light-guided electrodeposition technique. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5ee02863a'> </P>
Lim Do Gyeong,Lee Ho Yeon,Chung Ho Seok,Hwang Eu Chang,Jung Seung Il,Kwon Dong Deuk 대한요로생식기감염학회 2023 Urogenital Tract Infection Vol.18 No.3
Purpose: Emerging evidence has suggested that prior or concurrent antibiotic (ATB) use may be associated with a poor response to immune checkpoint inhibitors (ICIs) in patients with some solid tumors. This study examined the effects of ATB use on the oncological outcomes of patients receiving ICIs for mUC. Materials and Methods: Patients receiving ICIs for mUC between 2018 and 2020 were assessed retrospectively. Those with over three cycles of atezolizumab or pembrolizumab were included. ATB use, defined as ≥ three days within 60 days before or three months after ICI administration, was compared between groups for oncological outcomes. Results: Thirty-one patients were examined. The ATB-use and no-ATB-use groups consisted of 15 (48.4%) and 16 patients (51.6%), respectively. The ATB-use group showed a lower disease control rate (56.3% vs. 13.3%, p=0.023) than the no-ATB-use group. The objective response rate in the ATB-use group was lower than the no-ATB-use group, but the difference was statistically insignificant (43.7% vs. 13.3%, p=0.113). The ATB-use group had shorter progression-free survival (median three vs. six months, log-rank p=0.045) and shorter overall survival (median three vs. 14 months, log-rank p=0.023) than the no-ATB-use group. The most commonly used antibiotics were fluoroquinolones (46.7%), cephalosporins (40.0%), non-cephalosporin beta-lactams (6.7%), and nitrofurantoin (6.7%). Conclusions: ATB may be associated with poorer oncological outcomes in patients with mUC who received ICI therapy. Hence, further research will be needed to understand the relationship between the modulation of ATB-related dysbiosis and gut microbiota composition with the oncological outcomes in patients with mUC.
Three-dimensional hierarchical Te-Si nanostructures.
Lim, Jae-Hong,Shin, Gyeong-Jin,Hwang, Tae-Yeon,Lim, Hyo-Ryoung,Lee, Young-In,Lee, Kyu-Hwan,Kim, Sung-Dae,Oh, Min-Wook,Park, Su-Dong,Myung, Nosang V,Choa, Yong-Ho RSC Pub 2014 Nanoscale Vol.6 No.20
<P>Three-dimensional hybrid nanostructures (i.e., Te 'nanobranches' on a Si 'nanotrunk' or Te 'nanoleaves' on a Si 'nanotrunk') were synthesized by combining the gold-assisted chemical etching of Si to form Si 'nanotrunks' and the galvanic displacement of Si to form Te 'nanobranches' or 'nanoleaves.' By adjusting the composition of the electrolyte used for the galvanic displacement reaction, the shape of the Te nanostructures could be changed from nanoleaves to nanobranches. The Si nanotrunks with Te nanobranches showed stronger luminescent emission in the visible region, with their Raman spectrum having a higher wave number, owing to their grain size being larger. This suggested that the optical and photoelectrochemical properties of Te-Si hybrid nanostructures depend on their shape and size. Using this approach, it should be possible to fabricate various hierarchical nanostructures for use in photoelectronic and photoelectrochemical devices.</P>